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1. Tell whether the function is quadratic. Explain.

x -4 -2 0 2 4
y 21 1 -3 9 37

a. No, the function is not quadratic. The second differences are not constant.

b. Yes, the function is quadratic. The second differences are constant.

2. Tell whether the function is quadratic. Explain.

a. This is a quadratic function because it can be written in standard form as .

b. This is not a quadratic function because the - term is missing.

c. This is not a quadratic function because it is not written in standard form.

d. This is a quadratic function because it has an term.

3. Tell whether the graph of the quadratic function opens upward or downward.  

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Emejoi Temblaco
Emejoi TemblacoLv6
18 Feb 2021

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